// The MIT License (MIT)
// 
// Copyright (c) 2015-2025 Rasmus Mikkelsen
// https://github.com/eventflow/EventFlow
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

using System.Text;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Text;

[Generator]
public class AggregateExtensionsAttributeGenerator : IIncrementalGenerator
{
    public const string Namespace = "EventFlow.SourceGenerators";

    public const string AttributeName = "AggregateExtensions";

    private const string SourceCodeTemplate =
    """
    using System;

    namespace {0}
    {{
        [AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
        public class {1}Attribute : Attribute
        {{

        }}
    }}
    """;

    private readonly string SourceCode = string.Format(
        SourceCodeTemplate,
        Namespace,
        AttributeName);

    private readonly string SourceCodeFile = $"{AttributeName}Attribute.g.cs";

    public void Initialize(IncrementalGeneratorInitializationContext context)
    {
        context.RegisterPostInitializationOutput(ctx =>
            ctx.AddSource(SourceCodeFile, SourceText.From(SourceCode, Encoding.UTF8)));
    }
}
